Vacuum of a liquid?
Answer:
In reality, there is no such thing as "negative pressure." You either have pressure or you don't. Of course the idea of "negative" pressure is commonly used to discuss pressures that are lower than atmospheric pressure.
At a given temperature, all liquids have some vapor pressure. If the pressure of the gas phase around the liquid is lower than the vapor pressure, then additional liquid will evaporate until the pressure equalizes. An open container containing a liquid in space (or a vacuum chamber) will boil. As it boils, it cools off and the vapor pressure reduces because it's cooler. Eventually either all the liquid will evaporate or freeze. Of course, even a solid can have a vapor pressure and lose molecules--it's called sublimation.
This is a fact, like Absolute Zero Temperature cannot be attained, Absolute Zero Pressure likewise cannot.
As pressure gets near to Absolute Zero, the molecules of the substance and the chamber used to obtain the vacuum, actually produce a very tiny vapour pressure which cannot be removed.
Even in outer space, there are very small traces, (atoms and molecules) of gases that again, prevent total vacuum.
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